A2 Irda Serial Word Formats - Elster A100C Operating & Maintenance Instructions

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A100C - BS Single Phase Electronic Meter
_____________________________________________________________________________
A2 IrDA Serial Word Formats
high
Logic
levels
low
high
Infra-red
intensity
low
high
Output
current
low
Encoding of Infra-red and absolute serial data output pulses to represent serial word
A standard serial signal may be reconstructed by triggering a monostable (τ = 1/baud rate,
seconds) on receipt of each infra-red or serial pulse.
© Elster Metering Limited - M130 300 2C - 5.2007
Start
bit
0 1 0 1
Start
bit
0 1 0 1
Bit
time
Serial output word
Start
bit
0 1 0 1
Bit
time
Serial word
Data bits
0 0 1 1
IR frame
Data bits
0 0 1 1
Data bits
0 0 1
Stop
bit
0 1
Stop
bit
0 1
Pulse
width
Stop
bit
1 0 1
Pulse
width